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What makes an automatic car make a noise when it is turned on and when you change gears from reverse to park or park to any gear?
Bilbo80
There's a few reasons:
When a automatic transmission vehicle is turned on, the small but the seemingly small burst of energy it takes to start the car by means of combustion, it may rock the motor mounts and cause maybe a moving.. or bumping sorta sound. When you move the gear lever in any position, the energy from where in neutral, the torque converter, which keeps the engine running while in a gear, or switching to another selection of gears, has to mesh with the flywheel of the engine so that you can press down on the accelerator pedal/ brakes and causes the noise of the motor mounts absorbing that energy.
However, the noise shouldn't be a very loud noise, if it seems loud it could be either a motor mount(s) going bad and needing replaced, to possible transmission problems.
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